Please explain this in an easier form

Dear Student

The membranes of neurons are polarized it is described as the different type of channels is present on the neural membrane. These ion channels are selectively permeable to the ions or we can say only specific ion can pass through these channels . When there is no signal to neuron ie;  will be resting state of the axonal membrane and  is comparatively more permeable to potassium ions [K+] and  most of the time impermeable to sodium ions or we can say that sodium ions will not pass  Similarly, the membrane is impermeable to negatively charged proteins present in the axoplasm.
Axoplasm basically defines the cytoplasm of a nerve axon.

Consequently, the axoplasm inside the axons contains high concentration of [K+] and negatively charged proteins and low concentration of [Na+]. In contrast the fluid outside the axon contains a low concentration of [K+] a high concentration of [Na+] and due to this it will form a concentration gradient. These ionic gradients across the resting membrane are controlled  by the active transport of ions by the sodium potassium pump which transport [3Na+] outwards for [2K+].



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